This piece is for 4 hands piano. But what you hear in this recording is played back by the notation software. This piece can also be played by a single pianist if sufficiently advanced. The difficulty for a single pianist would lie on the rapid succession of thirds on the left hand, which requires great dexterity.
Lots of changes in key in this piece. The first 13 measures (i.e., the first 30 seconds) go through the following sequence of Major keys: A, D, A, D, G, C, F, and E-flat. It then remains in E-flat for most of the piece until near the end when it starts shifting through keys again.
Train Photo by Sarah L. Ernst (2014)

Full Steam Ahead!

I am a scientist who started composing music as a hobby in 2013. I have not studied composition and do not approach it analytically, only intuitively. I took piano lessons in my childhood and teens, but spent most of my adult life without playing piano until 2013. So far I have composed mostly for piano, in a polyphonic style that borrows from the Baroque as well as the Romantic spirit. I describe my style as "Baroquemantic". 

Most of my piano pieces are easy to play.  Some are very easy to play.  

All of my pieces rely on 2 or more concurrent melodies (counterpoint).

Art shown above: Image of clockwork heart found on the internet without attribution.
 
A Portuguese guy called "Carlos Miguel" wrote the following on YouTube and  I think this is so so so so true! I will be quoting him everywhere I can:
"...a boa música é como as boas palavras, depende de quem as diz e de quem as ouve...podem não vir a ser nada e podem ser tudo...ou ambas as situações em simultâneo...genial também é quem ouve...pelo seu modo de ouvir... e não só quem  compõe...pelo seu modo de compor...Carlos Miguel"

Freely translated from Carlos Miguel: "...Good music is like good words... it depends on who utters and who listens... it can be nothing or it can be everything... or both simultaneously... for there to be a work of genius there needs to be a genius listener as well as a genius composer..."

Full Steam Ahead!

Mariza Costa-Cabral